/* * Freescale MPC5200 PSC in I2S mode * ALSA SoC Digital Audio Interface (DAI) driver * * Copyright (C) 2008 Secret Lab Technologies Ltd. * Copyright (C) 2009 Jon Smirl, Digispeaker */ #include #include #include #include #include #include #include #include "mpc5200_dma.h" /** * PSC_I2S_RATES: sample rates supported by the I2S * * This driver currently only supports the PSC running in I2S slave mode, * which means the codec determines the sample rate. Therefore, we tell * ALSA that we support all rates and let the codec driver decide what rates * are really supported. */ #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \ SNDRV_PCM_RATE_CONTINUOUS) /** * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode */ #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) static int psc_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); u32 mode; dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" " periods=%i buffer_size=%i buffer_bytes=%i\n", __func__, substream, params_period_size(params), params_period_bytes(params), params_periods(params), params_buffer_size(params), params_buffer_bytes(params)); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S8: mode = MPC52xx_PSC_SICR_SIM_CODEC_8; break; case SNDRV_PCM_FORMAT_S16_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_16; break; case SNDRV_PCM_FORMAT_S24_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_24; break; case SNDRV_PCM_FORMAT_S32_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_32; break; default: dev_dbg(psc_dma->dev, "invalid format\n"); return -EINVAL; } out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); return 0; } /** * psc_i2s_set_sysclk: set the clock frequency and direction * * This function is called by the machine driver to tell us what the clock * frequency and direction are. * * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), * and we don't care about the frequency. Return an error if the direction * is not SND_SOC_CLOCK_IN. * * @clk_id: reserved, should be zero * @freq: the frequency of the given clock ID, currently ignored * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) */ static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", cpu_dai, dir); return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; } /** * psc_i2s_set_fmt: set the serial format. * * This function is called by the machine driver to tell us what serial * format to use. * * This driver only supports I2S mode. Return an error if the format is * not SND_SOC_DAIFMT_I2S. * * @format: one of SND_SOC_DAIFMT_xxx */ static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", cpu_dai, format); return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; } /* --------------------------------------------------------------------- * ALSA SoC Bindings * * - Digital Audio Interface (DAI) template * - create/destroy dai hooks */ /** * psc_i2s_dai_template: template CPU Digital Audio Interface */ static struct snd_soc_dai_ops psc_i2s_dai_ops = { .hw_params = psc_i2s_hw_params, .set_sysclk = psc_i2s_set_sysclk, .set_fmt = psc_i2s_set_fmt, }; static struct snd_soc_dai_driver psc_i2s_dai[] = {{ .playback = { .channels_min = 2, .channels_max = 2, .rates = PSC_I2S_RATES, .formats = PSC_I2S_FORMATS, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = PSC_I2S_RATES, .formats = PSC_I2S_FORMATS, }, .ops = &psc_i2s_dai_ops, } }; /* --------------------------------------------------------------------- * OF platform bus binding code: * - Probe/remove operations * - OF device match table */ static int __devinit psc_i2s_of_probe(struct platform_device *op, const struct of_device_id *match) { int rc; struct psc_dma *psc_dma; struct mpc52xx_psc __iomem *regs; rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); if (rc != 0) { pr_err("Failed to register DAI\n"); return 0; } psc_dma = dev_get_drvdata(&op->dev); regs = psc_dma->psc_regs; /* Configure the serial interface mode; defaulting to CODEC8 mode */ psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | MPC52xx_PSC_SICR_CLKPOL; out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); /* Check for the codec handle. If it is not present then we * are done */ if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) return 0; /* Due to errata in the dma mode; need to line up enabling * the transmitter with a transition on the frame sync * line */ /* first make sure it is low */ while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) ; /* then wait for the transition to high */ while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) ; /* Finally, enable the PSC. * Receiver must always be enabled; even when we only want * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */ /* Go */ out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); return 0; } static int __devexit psc_i2s_of_remove(struct platform_device *op) { snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai)); return 0; } /* Match table for of_platform binding */ static struct of_device_id psc_i2s_match[] __devinitdata = { { .compatible = "fsl,mpc5200-psc-i2s", }, { .compatible = "fsl,mpc5200b-psc-i2s", }, {} }; MODULE_DEVICE_TABLE(of, psc_i2s_match); static struct of_platform_driver psc_i2s_driver = { .probe = psc_i2s_of_probe, .remove = __devexit_p(psc_i2s_of_remove), .driver = { .name = "mpc5200-psc-i2s", .owner = THIS_MODULE, .of_match_table = psc_i2s_match, }, }; /* --------------------------------------------------------------------- * Module setup and teardown; simply register the of_platform driver * for the PSC in I2S mode. */ static int __init psc_i2s_init(void) { return of_register_platform_driver(&psc_i2s_driver); } module_init(psc_i2s_init); static void __exit psc_i2s_exit(void) { of_unregister_platform_driver(&psc_i2s_driver); } module_exit(psc_i2s_exit); MODULE_AUTHOR("Grant Likely "); MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); MODULE_LICENSE("GPL");